Bottom of the case? Theres room on top of the PSU cover thing I think.
EDIT:Hmmm doesn't look like with 4 GPU's there would be much clearance. You could remove the PSU cover thing if thats not a big deal but that does look hard to fit.

Hotswap backplane and rubber cable-hole grommets, eh? Glad to see Cooler Master taking a page out of Corsair's playbook

Corsair's playbook consists of taking features from other cases and blending it into a single package. Marketing played a bit part of the success of the 800D. However once you look past the hype, the ATCS 840 still offers the best features for your money.

I was never a fan of the original HAF. Something about having the word "HAF" stamped across the side didn't stand out to me. Well, it did, but not in a good way. I like this one though. It's all black, inside and out, and they have done away with putting "HAF" on it.

Looks like a ATSC eater and 800d killer. I would never run watercooling unless I was rich, so I won't be getting this... I don't think they'd make a smaller version either, I don't see much to improve in the 922 that's worth marketing a new product for :(

its slightly less over-bearing than the 932... if it came out a month ago I would have considered it, but I think i'll stick with my 800D

The HAF 932 is the best case I have ever owned. The three 230 mm fans keep it running
cool at full load for extended periods while OC to 3.6 G. The X looks like an improvement
over the 932 but I can't build again for 2 more years (sigh!).

+ Styling is... perhaps a bit "busy", but I think it looks ok
+ Utilizes fewer large fans rather than more small ones
+ Great front panel with usb 3.0 and esata
+ Side panels are "shaped" which makes them less prone to flexing/vibrating/noise
+ Made form steel, not Aluminum (quieter)
+ 6 5.25 bays
+ Black interior
+ Comes with wheels!

- Stupid sliding cover for power button
- Where does the second radiator go???
- Hotswap bays.... useless imo
- side window that showcases the sides of the 5.25 bays...

Of all cases currently on the market, if you don't want to spend crazy money on a custom case or a mountain mods case, get the HAFX for aircooling or the 700d for liquid.

- Cooler Master considers it mandatory that the front and side fan ducts be used in GTX 480 3-way condition. Also the front duct needs a fan preferably 120x38 and >90CFM.

- The top panel looks like it only supports 200mm fans, but will easily support 3 x 120 as well as a 360mm radiator. Also, it is possible to use a thick radiator over 65mm and use the top 200mm fan if needed.

- HAF X is designed to look like a main battle tank. Here are some hints to the styling:
Top cover: Top deck engine covers
Switch cover: Hatches on the turret
I/O: Front turret glacis plate
Front bezel: Tank treads
Side Panel: Reactive armor / Armor plating

It certainly is a beauty of a case, I like the look better than the HAF932 I have, and it'll be at the top of my list, should I need another case anytime soonish. Not that I have any plans, already have too many computers to juggle.
The cable management with the 932 was great, I can only see this as being better. Haven't noticed any pics of the back of the tray, does the cpu cutout line up any better? Kind of useless when you can't see the complete
backplate.